Cooled injection nozzle



June 16, 1942. w o 1- COOLEQ INJECTION NOZZLE Filed Jan. 18, 1940 Jnren/ar Patented June 16, 1942 1 UNITED 1 srA'res ,IPATE NT OFFICE coonsn INJECTION NozzL'n I Willy volt, Stuttgart, Germany, assignor to Robert B08011 Gesellschaft mit beschritnkter H8!- tung, Stuttgart, Germany Application January-18, 1940, Serial No. 314,517

In Germany February 2, 1939 through which the fuel'to be injected passes beagainst the action of the spring I! and permitting injection. of the fuel into the cylinder of the engine (not shown), through the injection channel I.

= 5' at the front end of the body 5 defining tog'ether the annular chamber III are connected by a narrow bar portion It left in the cutting operation, whereby the fuel is prevented from taking the short direct way from bore 9 to bore II- and is compelled to flow through the annular cooling cause no additional feed and discharge pipes are required which would occupy much space. Moreover,in the known nozzles of this type the cooling-chamber has been arranged in the nozzle plate in the form of a helical channel which isv very dimcult to be made. 7

chamber 10. The disc I5 is tightlyconnected to the portion 5'4, extending through its central bore, and to the portion! of the body 5, soldered oi welded seams l8 and [9, respectively.

' By way ofaltemative, screw joints (not shown),

It is an object of the -present invention to provide an injection valve of the kind referred to,

which is easy to make and very efllcient' in op- 'eration.

With this and further objects in view, as may become apparent from the within disclosures, the

invention consists not only in the structures herein pointed out and illustrated by the drawing, but includes further structures coming within the scope of what hereinafter may be claimed.

The character of theIinvention, however, may be best understood by reference to certain of its structural forms, as illustrated by the accompanying drawing in which:

Fig. 1 is a longitudinal section, I

Fig. 2a cross section on line 1-1 of Fig. 1. 7 Similar reference numerals denote similar parts in the difierent views. 1

Referringnow to the drawing in detail, it will beseenthatanomlebodyiistlghtly heldagainst a nozzle holder 3 bymeans of a tubular cap nut 4 which is screwed over a threaded portion 3' of the holder 3 and engages a shoulder 5' on the body 5, by means of an inward collar-4'. Guided inacentralboreofthebodyiisanozzleneedle 6 the conical forward end of which cooperates withavalveseatiiattheforwardendofanannular control chamber 13 for openingand closingtheiniectionchannelorietllnthebodyi.

'I'hefuelisfedthroughaborehnthenozzle holder 3 and a; bore 9 in the nozzle body 5 into acoolingchamberformed by an annular recessllcutintotheforwardendfaceofthenozzle bodyfiandacover l3. Fromthecoolingchamher the 'fuel flows through an inclined bore it may be provided for this purpose which are well known in the art and need not be illustrated.

It will'th'us be understood thatmy novel injection valve comprises a groove or recess It on the forward end face of the nozzle body 5 which recess surrounds the seat IQ for the nozzlem'eedle v i and the wall of the nozzle jet I and communicates on the one hand with the feeding channel 9 for the fuel and, on the other hand, through a bore 1 I, with the control chamber I3 for the nozzle needle, while the open side of the recess is closed by a cover which advantageously is tightlysoldered or welded to the nozzle body.

I declare that what I claim is: A

l. A fuel injection nozzle for internal combustion enginescomprising, a nozzle holder provided with a fuel inlet channel and having a flat inner end, a nozzle body provided with a fuel channel and having a flat end adapted to contact in fluid-tight relation the flat end ofsaid holder, with said fuel channels in register, means including a screw sleeve through which said inthebodyiintotlieahovementionedcontrol chamberliandactsimontheconicais'urfacefl of the nozzle needle Q, for lifting the needle as home body extendsand which. engages a shoulder intermediate the ends -ofsaid nozzle body to secure said nomle body tightly on said holder with a free end of said body extending unobstructed for some distance from said sleeve, a nomle needle in said body, said body being formed to provide integral therewith an exit nozzle let opening directly into the free end of said both! and a seat for said needle, the face of the free end of said body being provided with-a recess surrounding said seat and said 'jet and opening into said face. and a cover member tightly secured to the free end of said body and closing the open sideof said recess to define a cooling chamber.- said fuel channel in said nozzle body being con-V nected to said cooling chamber and said'cooling chamber being connected to said nozzle .iet

The inner portion 5"'an d the outer portion @mediatetheendsofsaidnomlebocbtosecure said nome body tiahtly on said holderwith a free end of said body extending unobstructed for some distance from said sleeve, a nozzle needle in said body, said body being formed to provide integral therewith an etit nozzle jet opening directly into the free end of said body'and a seat for said needle, the face of the free end of said body being provided with a recess surrounding said seat and said jet and opening into said face, and a cover member tightly secured to the free end of said body by soldering-or welding and closing the open side of said recess to define a cooling chamber which communicates with said fuel channel and with said nozzle jet and valve seat by means of a bore and a control chamber provided in said nozzle body between said bore and said exit nomle jet whereby fuel is delivered first to said cooling chamber and then to said nozzle jet. 7 3. A fuel injection nozzle for internal combus tion engines comprising, a nozzle holder provided aasass'a channel andhavingafiat endadaptedto contact in fluid-tight relation the flat end of said holder, with said fuel channels in register, means including a screw sleeve through which said nozzle body extends and which engages a shoulder intermediatetheendsof saidnoazlebodytosecure saidnoszlebodytightlyonsaidholderwitha free end of said body extending imobstructed for some distance" from said sleeve. a male needle in said body, said body being formed to provide integral therewith an exit nozzle jet opening directly into the free end of said body and a seat .for said needle, the face of the free end of said body being provided with an annular recess surrounding said seat and said jet and opening into said face, and a cover member tightly secured to the free end of said body and closing the open side of said recess to define a cooling chamber which communicates with said fuel channel and with said nozzle jet and valve seat by means of a bore and a control chamber provided in said nozzle body between said bore and said exit nozzle jet whereby fuel is delivered first to said cooling chamber and then to said nozzle jet, the outlet of said fuel channel and the inlet of said bore to said cooling chamber being separated by a bar portion provided across the annular recess with a fuel inlet channel and having a fiat inner tends and which engages a shoulder intermediate 40 the ends of said nozzle body to secure said nozzle body tightly on said holder with a free end of said body extending unobstructed for some distance from said sleeve, a nozzle needle in said body, said body being formed to provide integral therewith an exit nozzle jet opening directly into' the free end of said body and a seat for said needle, the face of the free end of said body bein provided with arecess surrounding said seat and said jet and opening into said face, and a flat cover plate, provided with a central opening, tightly secured to the free end of said body by soldering or welding, with the nozzle jet extending through said central opening,- said cover plate closing the open side of said recess to define a cooling chamber in the free end of said nozzle body, said fuel channel in said nozzle body being connected to said cooling chamber and said cooling chamber being connected to said nozzle jet whereby fuel is delivered first to said cooling chamber and then to said nozzle jet.

4. A fuel injection nozzle 'for internal combustion engines comprising, a nozzle holder provided with a fuel inlet channel and having a flat inner end, a nomle provided with a fuel in said nomle body.

5. A fuel injection nozzle for internal combustion engines comprising, a nozzle holder provided with a fuel inlet channel and having a fiat inner end, a nozzle body provided with a fuel channel and havinga fiat end adapted to contact in fluid-tight relation the fiat end of said holder, with said fuel channels in register, means including a screw sleeve through which said nozzle body extends and which engages a shoulder intermediate the ends of said nozzle body to secure said nozzle body tightly on said holder with a free end of said body extending unobstructed for some distance from said sleeve, a nozzle needle in said body, said body being formed to provide integral therewith an exit nozzle jet opening directly into the free end of said body and a seat for said needle, the free end of said body being provided with an annular fiat face and said face being provided with a recess surrounding said seat and said jet and opening into said face, and a fiat cover plate, provided with a central opening, tightly secured to the free end of said body by soldering or welding, with the exit nozzle jet extending through said central opening, said cover plate substantially covering the entire surface of said annular fiat face and closing the open side of said recess to define a cooling chamber in the free end of said nozzle body with the periphery of said cover plate corresponding substantially to the periphery of the unobstructed free end of said nozzle body, said fuel channel in said nozzle body being connected to said cooling chamber and said cooling chamber being connected .to said nozzle jet whereby fuel-is delivered first to said cooling chamber and then tosaid nozzle .iet.

win-Yvon. 

